DRAG FORCE
DRAG FORCE DRAG FORCE: Drag force is a force,which resistance offered by the fluid like air or water.if we consider a car travelling a point A to B,we put a hand outside thorugh the window,then we feel the opposive of air.its known as drag force. DRAG FORCE EQUATION: When the drag takes place in the presence of air, it is known as aerodynamic drag. When it takes place in water, it is known as hydrodynamic drag. F D = ½c_dρAv 2 Where, C_d-Drag co-efficient,which is dimensionless with value,depending upon the shape of object.(c_d=0.33-0.41 for mini cars and c_d=0.31-0.40 for sport cars etc...). ρ -rho is the density of fluid. V – velocity of the object. A – cross sectional area of object( In automonile 'A' consider as frontal area). UNIT OF DRAG FORCE:NEWTON or N Drag force is propotional to the square of the velocity.if the velocity of speed increases two times,drag force increases four times. EXAMPLE: A car travelling on a ...